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My brother has used a short cage Shimano 600 rear derailleur with a 32 tooth rear cassette. So despite what Shimano says, I think the short cage Dura Ace rear derailleur will shift the 32 tooth Ultegra cassette just fine.

I was researching this for ages too.I'm building a new bike on a well priced Dogma 2 frame.I wanted a Dura Ace 9000 but also an easier gear since I live in a area with mountains and some shocking sharp punchy climbs.So my bike shop are putting a 11-32 ultegra cassette on the Dura Ace, and they say it will work.I'm a total tech newbie, so I hope they are correct.

Running stock DA-7900 with 12-30 just fine. If you get a bit creative with the chain length, B screw, and possible 10t top pulley, 11-32 should be doable on most (all?) frames (RD hangers), I would reckon. For chain tension it might be advisable to trim to big-big cogs without the extra 2 links, at the price of giving up the front-big / rear-big cross-chained gear (which one shouldn't use anyway).

BTW, long cage Ultegra 6700 handles 11-34 out of the box (on another frame of mine). So there's room to go to an even wider range with that RD (probably not too much demand, though).